bug#60454: 30.0.50; `format-message' does not allow displaying "`" and "'" verbatim

[Ihor Radchenko]

Hi,

Following up https://list.orgmode.org/87k027af5x.fsf@localhost/T/#t
and 
https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=62dc49509c8962bd2a19c4c4475fc616eebdfde8

`format-message' and thus also `warn' unconditionally replace _all_ the
instances of "`" and "'" in the message:

    This acts like ‘format’, except it also replaces each grave accent (`)
    by a left quote, and each apostrophe (') by a right quote.

However, sometimes, it is desired to keep these chars literal.
For example, `org-assert-version' displays a warning that suggests Elisp
code:

(warn "...
   It is recommended to put
    (straight-use-package 'org)
...")

Replacing "'" is undesired here and will make copy-pasted Elisp code
incorrect.

Would it be possible to introduce some kind of escape mechanism in
`format-message' to produce literal "'" and "`" when needed?

In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.35, cairo version 1.17.6) of 2022-12-26 built on localhost
Repository revision: cc29fab3a66c59e77d0ff67c0f3e2e34ec80a03c
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Gentoo Linux

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
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